The most common Korean word for “under” is 아래 (arae). 「under」는 한국어로 아래.
Learn 아래 free — flashcards, audio and review →「아래」 단어장으로 무료로 외우기Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato